I definitely do not know 100% the answer. But, IMO, it wouldn't make sense for this to hurt your app. Why would it hurt? I mean I guess maybe you could be YP pwned if they notice and think you might do it again?
If you had a really good reason to not attend before - and I mean you are going to write an addendum and/or "why I would attend if admitted this time", then I don't feel that it would hurt you. But if you just simply don't mention it, how could it not? If the school was not good enough for you to attend in a previous year, why would it be now? What changed? This, of course, depends on the school actually reading your application. If everything is index based maybe it will just go through. Although many apps if not all ask if you applied before regardless of outcome, I suspect they are going to look it up. It has to matter, I just don't know how.